Electrophilic selenocyclization in 2-ene-1,5-diol systems: unexpected oxetane vs. tetrahydrofuran formation
摘要:
Electrophile-induced cyclization of (E)- and (Z)-2-ene-1,5-diols to tetrahydrofurans and oxetanes is described. Significant differences between the present report and previous work have been noted. A tentative model is proposed. (C) 2003 Elsevier Ltd. All rights reserved.
Concise total synthesis of unnatural (2S,3S)-6-hydroxy-4-sphingenine containing sphingolipids using a hydrozirconationtransmetalation reaction and an unusual three-step-one-pot deprotection sequence.
Structural and Functional Analysis of Bacterial Sulfonosphingolipids and Rosette‐Inducing Factor 2 (RIF‐2) by Mass Spectrometry‐Guided Isolation and Total Synthesis
作者:Daniel Leichnitz、Chia‐Chi Peng、Luka Raguž、Florentine U. N. Rutaganira、Theresa Jautzus、Lars Regestein、Nicole King、Christine Beemelmanns
DOI:10.1002/chem.202103883
日期:2022.2.7
Similarities across species: MS-guided isolation and the first totalsynthesis of bacterialsulfonosphingolipids allowed bioactivity studies on their rosette-inducing and inhibiting capabilities in Salpingoeca rosetta. The most abundant sulfonosphingolipids inhibited rosetteinducing factor-related activity in a concentration-dependent manner thus suggesting that sulfobacins are likely competing for
First Asymmetric Synthesis of 6-Hydroxy-4-Sphingenine-Containing Ceramides. Use of Chiral Propargylic Alcohols To Prepare a Lipid Found in Human Skin
作者:Jiong Chun、Hoe-Sup Byun、Robert Bittman
DOI:10.1021/jo026240+
日期:2003.1.1
present here the first synthesis of the 6S and 6R diastereoisomers 2 and 3, which represent analogues of (2S,3R)-ceramide (1) having two allylic hydroxyl groups. Chiralpropargylicalcohols 8 and 11, which were prepared by asymmetric dihydroxylation of alpha,beta-unsaturated ester 13 and allylic chloride 22, respectively, were employed as precursors of 2 and 3. Nucleophilic addition of lithiated TBS-protected
Electrophilic selenocyclization in 2-ene-1,5-diol systems: unexpected oxetane vs. tetrahydrofuran formation
作者:Pierre Van de Weghe、Stéphane Bourg、Jacques Eustache
DOI:10.1016/s0040-4020(03)01134-7
日期:2003.9
Electrophile-induced cyclization of (E)- and (Z)-2-ene-1,5-diols to tetrahydrofurans and oxetanes is described. Significant differences between the present report and previous work have been noted. A tentative model is proposed. (C) 2003 Elsevier Ltd. All rights reserved.